Your #1 Choice For Mason County

We design all types of systems at very competitive rates. Based on your lot layout, soil type, and soil depth, we will design the best and most cost-effective solution for your specific situation. We can help you navigate the process of developing your property, of which septic systems design is a vital component.

We service the entire Mason County area – Shelton, Union, Belfair, Hoodsport, Tahuya, Grapeview, Matlock, etc. Arrow Septic Designs (previously named Arrow Excavating) has been serving Mason County since 1980.

Why Choose Arrow Septic Design

Septic Design Experts

Works only in Mason County

Recommended By Other Professionals

Frequently Asked Questions

We want you to understand the process so you feel confident every step of the way! 

What if my septic system has failed and I cannot afford to pay for a new replacement system?

We have worked on dozens of projects in partnership with a wonderful organization that provides low interest septic replacement loans, they are called Craft3 and here is a link to their website where you can apply right online for their Clean Water Loan:


Their interest rates are based on your income level and they beat rates of most banks and credit unions. Plus, we have found their staff to be kind, understanding people who make the process as smooth as possible.

How do I know what kind of septic system I will get?

Your septic system will be customized to your site based on your planned usage, soil type, and soil depth. Planned usage, such as the number of bedrooms, and your soil type determine drainfield size. Your native soil depth determines your system type such as gravity, pressure, pretreatment, or mound. We will design you the simplest and most cost-effective system based on your circumstances that meets all state and local regulations and will meet your specific needs.

How do I know which installers I can trust?

Mason County has a list of certified installers that you can choose from. We can help narrow down recommendations based on where your property is located in Mason County. We can refer you to specific contractors who have a proven track record and who have worked with us successfully on previous projects.

How long will my process take?

Once we gather all of the information about your project, the first step is to get test holes dug and brush out the site in the area you would like the drainfield to be placed. From this point, we can typically visit your site within a couple of weeks. After our site visit, we will send you a layout drawing for review and approval. After your approval, we complete the design packets and submit them to the county health department. The health department typically reviews designs within 4-6 weeks depending on the time of year and work volume.

Of course, on an urgent repair system, these timeframes are expedited.

What kind of payments do you take?

Most of our clients prefer to pay by check! We take all forms of payment... cash, check, money order, or credit card.

Payment of Mason County fees must be made in a separate check or money order, sent to our address so we can submit it with your paperwork. We do not pass their funds through our books.

Septic Design Mason County

Our local family business is here to support you!


We don’t just work in this community, we live here, we are raising our family here, and we even grew up here.   We are passionate about helping our friends and neighbors and protecting our local environment one job site at a time. 


Your team


Paula Johnson

Paula Johnson

Dirt Expert

If it is complicated or needs special attention, Paula is your gal! 

Angie Duvall

Angie Duvall

The Frog Enthusiast

Field assistant and paper cranker, Ang gets the job done! 

Isabelle McGuire

Isabelle McGuire

The Action Taker

Often it is Isabelle’s friendly voice you will hear on the phone!  As she gathers information and sets up job files. 

Let's start on your design today!

Don't delay